gamma

(gămˈə)

1. The third letter of the Greek alphabet. See Table at alphabet.
2. The third item in a series or system of classification.
3. A unit of magnetic intensity equal to one hundred thousandth (10^-5) of an oersted.
4. A unit of mass equal to one millionth (10^-6) of a gram.
5. Chemistry The third position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted.